To Remove Calendars of Deleted Users

If you have deleted one or more users with the Calendar Server Utility command csuser delete, or with Delegated Administrator Console or Utility, calendars
owned by that user might still be present in the database.

There are two ways to remove users’ calendars. The method to use depends
on the tool you used to delete the user:

csuser

The csuser utility removes the user from the LDAP
directory and removes the user’s default calendar, but not any other calendars
the user might own. For instructions on how to use cscal to remove
these calendars, see To Remove All Calendars of a User Deleted with csuser.

Delegated Administrator

Delegated Administrator does not remove any calendars. Use Delegated
Administrator to mark users for deletion and then use Calendar Server Utility csclean to remove calendars for user's marked for deletion.